let boards = [{
        key: 'in_theaters'
    }, // 正在上映
    {
        key: 'coming_soon'
    }, // 即将上映
    {
        key: 'new_movies'
    }, // 新片榜
];

boards.map(item => {
    console.log(item.key);
})

let json = {
    '0': 'item1',
    '1': 'item2',
    '2': 'item3'
}

let arr = Array.from(json);
console.log(arr);
